Chemistry - Tests for Anions

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Chemistry

Chemical Reactions

IGCSE Chemistry

CIE

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7 Terms

1
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Carbonate CO3(2-) (Add dilute acid)

Effervescence, carbon dioxide produced

2
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Chloride Cl- [in solution] (Acidify with dilute nitric acid, then add aqueous silver nitrate)

White ppt.

3
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Bromide Br- [in solution] (Acidify with dilute nitric acid, then add aqueous silver nitrate)

Cream ppt.

4
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Iodide I- [in solution] (Acidify with dilute nitric acid, then add aqueous silver nitrate)

Yellow ppt.

5
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Nitrate NO3- [in solution] (Add aqueous sodium hydroxide, then aluminium foil; warm carefully)

Ammonia produced

6
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Sulfate SO4(2-) [in solution] (Acidify, then add aqueous barium nitrate)

White ppt.

7
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Sulfite SO3(2-) (Add dilute hydrochloric acid, warm gently, and test for the presence of sulfur dioxide)

Sulfur dioxide produced will turn acidified aqueous potassium manganate (VII) from purple to colourless